Analog Devices Inc. AD7713ARZ

Overview

AD7713ARZ from Analog Devices is a 24-bit charge-balancing sigma-delta ADC with programmable gain front end (G=1–128), dual differential analog inputs, one high-voltage single-ended input (up to ±10 V at G=1), on-chip RTD excitation (200 µA ×2), and self-calibration - designed for loop-powered smart transmitters in industrial process control.

For engineers reviewing the AD7713ARZ datasheet, AD7713ARZ pinout, AD7713ARZ application, or AD7713ARZ equivalent, this page delivers verified technical context, real-world timing and noise performance, calibrated accuracy specs, SOIC-24 package mapping, and two validated alternative parts for RTD-based measurement systems.

Technical Context

The AD7713ARZ employs a proprietary analog modulator followed by an on-chip digital filter with programmable first-notch frequency (2 Hz to 200 Hz), enabling configurable settling time and 50/60 Hz rejection ≥100 dB. Its LC2MOS architecture supports single-supply operation (AVDD = 5–10 V, DVDD = 5 V) and integrates two 200 µA RTD current sources with <±1% matching.

It features a bidirectional serial interface (SCLK, RFS, TFS, SDATA, DRDY) supporting both self-clocking and external-clocking modes, with register-level control of gain, polarity, filter notch, and calibration mode via a 24-bit control register. Input sampling rate is f_{CLK_IN}/512, and full-scale drift is as low as 0.3 µV/°C at G≥4.

Key Specifications

Pinout & Package

AD7713ARZ is housed in a 24-lead SOIC (RW-24) package, 0.3 inch wide, RoHS-compliant, with exposed pad not present. Pin functions are fully defined per Analog Devices REV. D datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision, loop-powered ADC applications.

Compared with AD7713ARZ, AD7124-4BRUZ offers better integration (on-chip ref, bias, oscillator) but sacrifices loop-power flexibility due to strict DVDD limits; ADS124S08IPWR provides higher channel density and lower power but omits the critical ±10 V AIN3 path needed for legacy 0–10 V sensor interfaces.

Availability

AD7713ARZ is available at Aetrix Electronics and suitable for loop-powered transmitters, RTD temperature sensing, and portable industrial instrumentation requiring stable component supply over extended temperature ranges (–40°C to +85°C).

Supply support for AD7713ARZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7713ARZ belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-power, high-accuracy industrial measurement in harsh environments - emphasizing noise immunity, self-calibration, and seamless integration into 4–20 mA loop architectures.

FAQ

What is the maximum input voltage range supported by AD7713ARZ on its AIN3 pin?

The AD7713ARZ AIN3 pin supports a single-ended input voltage range of 0 to +4×V_REF/G. With a nominal 2.5 V reference and gain = 1, this yields 0 to +10 V. Absolute voltage must remain within –0.3 V to +22 V relative to AGND. The AD7713ARZ does not support bipolar operation on AIN3 - only unipolar input coding applies.

Does AD7713ARZ support true 24-bit performance across all operating conditions?

Yes - AD7713ARZ guarantees 24-bit no missing codes performance when the digital filter's first notch is set to ≤12 Hz. At higher notch frequencies (e.g., 50 Hz), resolution degrades to 18 bits minimum. This trade-off is documented in the "No Missing Codes" specification table and directly tied to filter settling behavior - not device defect or design limitation.

How does the AD7713ARZ handle RTD lead resistance compensation?

The AD7713ARZ uses its dual 200 µA RTD current sources (RTD1 and RTD2) to implement 3-wire RTD compensation: one current excites the RTD element while the other sources current into the sense lead, canceling voltage drop error from lead resistance. Matching between RTD1 and RTD2 currents is ±1% initial and 3 ppm/°C drift match - confirmed in the "RTD EXCITATION CURRENTS" section of the datasheet.

Can AD7713ARZ operate from a single 5 V supply for both AVDD and DVDD?

Yes - AD7713ARZ is fully specified for AVDD = DVDD = 5 V ±5%. In this configuration, total supply current is ≤1.1 mA (0.6 mA AVDD + 0.5 mA DVDD), resulting in ~5.5 mW power dissipation. The part also supports AVDD up to 10 V for higher sensor excitation, while DVDD remains fixed at 5 V (not to exceed AVDD by >0.3 V).

What calibration modes are available on AD7713ARZ, and how are they triggered?

AD7713ARZ supports three calibration modes: self-calibration (zero + full-scale, internal references), system calibration (two-step: zero then full-scale, using external inputs), and background calibration (continuous zero tracking). All are controlled via the 24-bit control register's MD2–MD0 bits. DRDY asserts low during calibration and returns high upon completion - no timeout or polling required for self-calibration.